Ensemble Effect of Ni in Bimetallic PtNi on Reduced Graphene Oxide Support for Temperature‐Dependent Formic Acid Oxidation

Abstract

Easy transportability, safety storage and low temperature operating conditions make direct formic acid fuel cells (DFAFCs) and direct methanol fuel cells (DMFCs) suitable alternatives to high temperature solid oxide fuel cells. These low temperature fuel cells generally use platinum or platinum-based electrocatalysts. However detrimental effect of poisonous intermediates formed during formic acid and methanol oxidations makes platinum vulnerable and led to the development of platinum based bimetallic alloy and composite electrocatalysts. In this work, we have prepared graphene supported platinum and platinum-nickel bimetallic electrocatalyst to study the catalytic activity towards formic acid oxidation. Further, we have also carried out the temperature-dependent kinetic studies of these catalysts to understand the mechanism of formic acid oxidation at various temperatures. Our findings confirmed that the ensemble effect of Ni in platinum-nickel bimetallic catalysts shows the higher catalytic activity by using a lesser amount of expensive platinum.

Zinc oxide-decorated polypyrrole/chitosan bionanocomposites with enhanced photocatalytic, antibacterial and anticancer performance

“…The electrochemical surface area was calculated by determining electrochemical double layer capacitance (EDLC) values using the cyclic voltammetry (CV) technique [52][53][54] (see ESI †). The voltammograms were obtained in the potential range from À1.5 to 1.5 V at different scan rates, namely, 10 mV s À1 , 20 mV s À1 , and 30 mV s À1 .…”

Ferrite Nanocomposite Based Electrochemical Sensor: Characterization, Voltammetric and Amperometric Studies for Electrocatalytic Detection of Formaldehyde in Aqueous Media

“…The electroactive surface area of the modified electrodes were investigated by cyclic voltammetry [68]. To investigate the active surface areas of the ANF/GCE and ANFC/GCE modified electrodes, cyclic voltammetry was executed in non‐faradic potential range (1.1–1.2 V vs RHE) at varying scan rate from 20–80 mV s −1 as depicted in Figure 4b.…”

Ag2S-Sensitized NiO–ZnO Heterostructures with Enhanced Visible Light Photocatalytic Activity and Acetone Sensing Property

“…The surface area of the synthesized nanocomposites (NZ and AZN) was calculated by electrochemical double-layer capacitance (EDLC, C dl ). , For the measurement of the active surface area, CV was performed in the non-faradaic potential range of 0.1–0.2 V with varying scan rates (10–80 mV s –1 ) (Figure a). The linear slope of the plot (capacitive currents vs scan rates) was used to represent the surface area and is equal to twice the double-layer capacitance ( C dl ).…”